<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
     <style>
     
      div{
          width: 100px;
          height: 100px;
          background-color: hotpink;
      }

     </style>
</head>
<body>
    
      <button>开始</button>
      <button>暂停</button>
    <div></div>

</body>
</html>